Battery adiabatic thermal runaway process parameter acquisition method

Abstract

The invention discloses a battery adiabatic thermal runaway process parameter acquisition method. The method comprises the following steps: S1, modeling the adiabatic thermal runaway process of a lithium ion battery to acquire the relationship between the temperature change in the adiabatic process and the adiabatic thermal runaway parameter of the battery; wherein the thermal runaway parameters comprise a self-heating temperature T1, a temperature sudden change temperature point T2, a chemical reaction forward factor A, reaction activation energy Ea, a total chemical reaction heat release amount delta Hchem, a total internal short-circuit heat release amount delta Hel and a total heat release amount delta H in the adiabatic thermal runaway process of the lithium ion battery; S2, performing an adiabatic thermal runaway test on the lithium ion battery, and dividing the thermal runaway process of the battery into different stages based on a temperature change curve and a temperature riserate curve in the adiabatic thermal runaway process of the battery; and S3, based on the thermal runaway test result, obtaining battery adiabatic thermal runaway process parameters. Based on lithiumion battery adiabatic thermal runaway process analysis, the problem that battery adiabatic thermal runaway parameters are difficult to obtain is solved, and the method can be used for evaluating battery safety.

Description

technical field [0001] The invention belongs to the field of safety analysis of lithium-ion batteries, and relates to a method for acquiring parameters of the adiabatic and thermal runaway process of the battery. Background technique [0002] Due to the advantages of high working voltage, high energy density, high discharge rate, long cycle life, no memory effect, and no pollution to the environment, lithium-ion batteries have been widely used in communications, new energy vehicles, smart grids and other fields. At the same time, due to the advantages of high output power, wide temperature range, and low self-discharge rate, lithium-ion batteries are also widely used in the field of national defense. [0003] The safety of lithium ions is the first consideration in the use of batteries. In recent years, thermal runaway accidents of battery systems of electric vehicles have emerged one after another, endangering people's lives and property, and at the same time hitting the p...

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to design a method for obtaining the parameters of the adiabatic and thermal runaway process of the battery in order to solve the problem that the internal state of the lithium-ion battery is difficult to directly measure and how to evaluate the safety of the battery according to the experimental test data

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